M2 Tool Steel
| Chemical Analysis: | |
|---|---|
| Carbon | 2.15/2.50 |
| Manganese | .60 Max. |
| Phosphorus | .030 Max. |
| Sulfur | .030 Max. |
| Silicon | .60 Max. |
| Chromium | 11.50/13.50 |
| Vanadium | 3.80/4.40 |
| Tungsten | ------- |
| Molybdenum | .70/1.20 |
| Cobalt | ------- |
| Tempering Temp. º(F): | Oil Quenched Hardness Rc | Air Quenched Hardness Rc |
|---|---|---|
| 300 | 65.0 | 65.0 |
| 400 | 64.0 | 63.0 |
| 500 | 63.0 | 62.5 |
| 600 | 62.5 | 62.5 |
| 700 | 63.0 | 62.5 |
| 800 | 63.5 | 63.5 |
| 850 | 63.5 | 63.5 |
| 900 | 65.0 | 64.0 |
| 950 | 66.0 | 65.0 |
| 1000 | 66.0 | 65.5 |
| 1050 | 66.0 | 63.5 |
| 1100 | 64.5 | 61.5 |
| 1150 | 62.0 | 60.0 |
| 1200 | 53.5 | 53.0 |
| 1300 | 43.0 | 39.5 |
Uses:
Drills, taps, punches, reamers, broaches, planer knives, lathe tools, forge dies, form cutters, milling cutters, end mills, gear cutters.
Forging/Rolling:
Preheat to 1300° F - 1500° F and soak thoroughly. Then raise to 2050° F - 2100° F. Do not forge or roll below 1800° F, cool slowly from the forging or rolling temperature. Do not normalize.
Annealing:
Heat slowly to 1600° F, and hold for uniformity, cool at a rate of 30° F per hour to 900° F, then air cool. Expected Brinell hardness 241 max.
Hardening:
Preheat slowly to 1550° F, soak until uniformly heated, and heat rapidly to 2250° F - 2275° F. Heating times may vary from a few minutes to a maximum of 15 minutes, depending on the size of the tool. Oil quench to develop higher hardness, although air or hot salt quench may be used.
Tempering:
Temper immediately after quenching, before the part has cooled to below 150° F. A tempering range of 1000° F - 1050° F is recommended. Parts should be held a minimum of 2 hours per inch of thickness. Double tempering is recommended. The following tempering table may be used as a guide. 1" dia. specimens were used for this test, it may be found that heavier sections are several points lower. Table is based on a 2250° F hardening temperature.